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  1. #1
    New Member
    Join Date
    Jun 2012
    Posts
    3
    Location
    Landenberg, PA
    Tractor
    JD 410B 4x4

    Default Symptoms of a weak hydrolic pump??

    1984 John Deere 4x4 backhoe 410B with 5700+ hours....My question is; when it's already warm and you try to lift the front bucket there is a hesitation and shudder; and then it will lift. Also when you drive it on the road in "high" the brakes have to be pumped 1st in order for them to work - then work great (brake pressure gets lost for some reason). Could these 2 issues be related to a weak hydrolic pump?

  2. #2
    Super Member crazyal's Avatar
    Join Date
    Dec 2003
    Posts
    6,136
    Location
    Northern Vermont

    Default Re: Symptoms of a weak hydrolic pump??

    I have to ask, have you checked the basics first? Check the level of the hydraulic fluid? Replaced the Hydraulic filter? If neither of them fix the problem replace the fluid (unless you know it was done not too long ago). I don't know JD but I can find no reason why the brakes would be tied into the tractor's hydraulics.

    Pumping the brakes are usually a sign of air in the brake lines. As long as the brake fluid isn't dropping I would say all you need to do is bleed the system.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  3. #3
    New Member
    Join Date
    Jun 2012
    Posts
    3
    Location
    Landenberg, PA
    Tractor
    JD 410B 4x4

    Default Re: Symptoms of a weak hydrolic pump??

    I'm not that familiar with JD either (more familiar with CASE); this one was recently purchased from a state township. As far as I know the brakes are in the hydrostatic transmission; and the fluid was replaced not too long ago (though it is slightly over filled). Don't know if the filter was replaced when new fluid was put in. Thanks for the suggestions.

  4. #4
    Elite Member
    Join Date
    Jan 2010
    Posts
    2,814
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: Symptoms of a weak hydrolic pump??

    I believe this model JD used a priority flow control to supply the oil to steering and brakes. Don't remember the circuit exactly but I believe the brakes circuit also had a pressure reducing valve in it to control the pressure to the brake circuit. If this valve is getting sticky it could cause the symptoms you decribe.

    Not sure how or why pumping them would help build pressure since from memory they had a constant flow and pressure source.

    On the 4 x 4 versions the filter is a real PITA to access and change. I would take a good look at the filter housing to see if it looks like any one has changed the element.

    Does the BH run OK?
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  5. #5
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,648
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Symptoms of a weak hydrolic pump??

    Why not put a hyd gage in the circuit and monitor the hyd system. Check relief pressure.

    Hesitation could be caused by air in the cyl.

    Cycle the lift and bucket cyl about 5 times until the relief goes off and that should purge any air for the moment.

    If you do have air, you could have a suction leak. Check tank for bubbles.

    A relief valve might have some debris under the seat and heating up the fluid.

    Is your hyd system open or closed center?
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

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